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OpenStudy (anonymous):
If A={2,4,6,8,10,12,14}, B={1,3,5,7,9,11}, and C={3,6,9,12}, how many numbers are in the set A U B U C?
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OpenStudy (anonymous):
think of U as put them all together, but dont count the same number twice
OpenStudy (anonymous):
no, i don't think that is what U suppose to mean
OpenStudy (anonymous):
A U B U C = 1,2,3,4,5,6,7,8,9,10,11,12,14 ALL TOGETHER 13 NUMBERS
OpenStudy (anonymous):
thank you @koymoi
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